net80211: remove if_private.h from code that doesn't require it

The previous clean-ups to remove some direct ifp manipulation have
removed the need for if_private.h in these source files.

Differential Revision:	https://reviews.freebsd.org/D50646
Reviewed by:	bz

sys/net80211/ieee80211_adhoc.c

@@ -48,7 +48,6 @@
 #include <net/if_var.h>
 #include <net/if_media.h>
 #include <net/if_llc.h>
-#include <net/if_private.h>
 #include <net/ethernet.h>
 
 #include <net/bpf.h>

sys/net80211/ieee80211_hostap.c

@@ -48,7 +48,6 @@
 #include <net/if_var.h>
 #include <net/if_media.h>
 #include <net/if_llc.h>
-#include <net/if_private.h>
 #include <net/ethernet.h>
 
 #include <net/bpf.h>

sys/net80211/ieee80211_scan.c

@@ -43,7 +43,6 @@
 #include <net/if.h>
 #include <net/if_var.h>
 #include <net/if_media.h>
-#include <net/if_private.h>
 #include <net/ethernet.h>
 
 #include <net80211/ieee80211_var.h>

sys/net80211/ieee80211_scan_sw.c

@@ -41,7 +41,6 @@
 #include <net/if.h>
 #include <net/if_var.h>
 #include <net/if_media.h>
-#include <net/if_private.h>
 #include <net/ethernet.h>
 
 #include <net80211/ieee80211_var.h>

sys/net80211/ieee80211_sta.c

@@ -49,7 +49,6 @@
 #include <net/if_llc.h>
 #include <net/if_dl.h>
 #include <net/if_var.h>
-#include <net/if_private.h>
 #include <net/ethernet.h>
 
 #include <net/bpf.h>

sys/net80211/ieee80211_wds.c

@@ -48,7 +48,6 @@
 #include <net/if_var.h>
 #include <net/if_media.h>
 #include <net/if_llc.h>
-#include <net/if_private.h>
 #include <net/ethernet.h>
 
 #include <net/bpf.h>